Electrical receptacle



y w. M. GILBERT.

ELECTRICAL RECEPTACLE.

APPLIQATION FILED DCT. lh 1917.

1,404,953, Patented Jan. 31, 1922.

, Y* n k 'm mi ag w I E m m f' "WM www SQ i S w Q S 1X N; l l u r ix" l A mi H s s y m o v l 1"" u! 4 INVENTOR.

ATTORNEY.

.rare Erice. ,y

WaLTnn erinnern-Ln GILBERT, or EAST rranTroan; CONNECTICUT ELECTRICAL RncnTTAcLn.

incassa l To'aZZ whomz't 771m/ @Guccini/.5 y lie it known that l, ilnn'rnniMnnniLLn Grrr naar, a citizen ofttheUnited States, residing at llast Hartford, in the countyoiPv Hartford anc State of Connecticut, `have invented a new and Improved Electrical Receptacldof which the following ka specification.

, invention relates to the class of electrical rboxes or receptacles that arc'more especiallyl designed for temporary*connection olE electrical devices, as motors, employed tor ruiming machinery of 4various sorts, and an object ot rmy invention, among others,` is to provide receptacle that` will enable persons havingr little .knowledge oit electricity, andespecially unskilled help, to make the necessary coni/iections withoutcanger ojl personal inJury or ingury to `the mechanism.

. One form oit device embodying my inv'entionand in the construction yand use oi' which, the objects herein setr out, aswell asothers, may `be attained, is illustrated in the accompanyinglf drawings, inwhich-e` Figure 1 is aiace view cfa receptacle em-v body-ing my invention shown with the cover raised: .l c y Figure 2 is a view .in section through the same on plane denoted by dottedline2-2 of liigure 1.`

Figure 3 is a detail view of the plug block.

.it is now customary to place machinery of certain kinds upon trucks, together withthe motors for driving such machines, in order to readily locate such machines in different places where they may be needed. incidents oit such uses` occur in coal-yards, lumberyards, concrete mixing plants, &-c.l`-1eans tor connection of the electrical. cable to drive such motors are provided at the different places where the machinery is required forv use. Such machinery is often operated by unskilled labor, or employees unacquainted with the character o1 electricity and it is essential, therefore, that sate-guards shall be provided to prevent accident from electrical may be readily made with little danger of in'ur to the ersons makino` such connections irrespective of the conditions that may otherwise exist for the transmission of elec- 'trical currents through the body ot such person and that might otherwise result in in juryowingto lack `of knowledge as to the danger from` such conditions.

`ln the .accompanying drawings the ynumeral 5. indicates a receptacle orbozrthat vSpecification of Letters Patent.' i .Pgijnted Jan, 2,1,y 1922 aplicar-im; mea october i1, isi?. fsm-ilaria),k iaaeasv usual construction are pivotally attachedto Y posts 10said vblades being adapted to electrically ngage contacts 11 in a manner com monto devices ot' thiskindgkv The contactsv 11 have thensual conducting wires 12.-13 attached to them in anyfsuitable manner andthe posts 10 are electrically connected 'with terminals 14, such connection including uses 15. c i v c V y y f Contacts 16 are secured to the plate? and thelvlare connected by wires 17 with theterminals .14e c A .socket 18 is formed `in, the plate 7 to receivea positioning pin 19` pro-y jecting froml the bottoni oty a plugA 20. Blades 2,1 project from opposite sides of the plug and a 4cable 22 containing the usual conducting wires is secured to the plugin any suitable manner, said wires bein con- 19 and blades 21 vare so positioned with re-v spect each to the others that the two blades 21 can engage the contacts 16 only when the pin 19 is in the socket 18, and when the blades thus engage the contacts each blade must engage that contact that is especially designedfor it to engage. That is, the plug `is so constructed that when the pin is in yits socket the blades will so engage the contacts as notte cross the electrical current.

It will be understood that the wires in the cable 22 are, when the plug is in use, attached to the proper terminals of a motor used for driving machinery, my invention being especially applicable in cases where portable machinery, as a concrete mixer mounted upon a truck, is transported from place to place about a yard or building, receptacles 5 being permanently located at such points as it :may be desired to use'the vmachinery at.

A switch actuating shaft 24:is rotatably` mounted upon the receptacle, as herein shown in the sides of the boX, and an actuating finger 25 projects from the shaft through aloop 26 on a cross bar 27 of insulating material secured 'to the switch blades 9. This finger is of a length to `project beyond the loop and overlie the plug 20 When the switch is closed, and,` therefore, in such position with respect to the location of the vplug-that the latter cannot be inserted or removed Without the llinger being raised. suliiciently to'cause the switch to be open. It Willthus be apparent that the'y plug 20, When in place,

cannot be removed until'the iingr 25 is pecially to inexperienced help that isusually employed. inthe operation ofportableV machinery of diiferent kinds driven by electric motors and that is moved about from place to Yplace VWhere the operation or' a machine may be required It also ,removes all liability to injury of the'electrical and other machinery Such as might be caused by im- Vproper placing of the plug 'by such ine'x perienced help. A handle 28, located out 1 side of thefbox, is connected with the shaft 24 as a means for operating it.

.The cable is so attached to theV plug and ithe Single positioning pin is so arranged With respect thereto that any excess pull upon the cable will cause the pin to be pulled from its socket and that Ain such operation the switch to be automatically opened thereby..

lt, therefore, follows that `'carelessness or oversight in movingthe machinery to Which the` cable is attached will be counteracted as thev detachment of the plug above described will occur before force enough has been applied to break the Wires. j v

In accordance With the provisions ofthe patent statutes, I have described the principles of operation of ymy invention,VV together With'the apparatus which I now consider to represent the besty embodiment thereof; but I, desire to have it understood thatv the apparatus shown is only "illustrative, and that the invention may be carried out by other means. .Y

I i l A receptacle lincluding terminals for the inlet and outlet Wires of an electric circuit, a removable plug, blades projecting from oppositesides of the plug, and adapted to enter the openl upper endsof terminals, and al pin projecting froml the bottom of the plug in position to control insertion of each 'of they bladesVV Within the'terminal intended orit. Y. l

l/V ALTER MERK-ILLE GILBERT, 

